Income Taxes - Losses Before Income Taxes and Non-Controlling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Total	$ (289.0)	$ (48.1)	$ (229.3)
Domestic
Income Tax Examination [Line Items]
Total	(331.0)	(229.1)	(290.8)
Foreign
Income Tax Examination [Line Items]
Total	$ 42.0	$ 181.0	$ 61.5